Provided is a treadmill. The treadmill includes a shock absorbing portion configured to absorb a shock applied to a deck. The shock absorbing portion includes a second anti-vibration rubber portion having a third surface fixed to a frame and a fourth surface fixed to the deck. The third and fourth surfaces are perpendicular to a plate surface direction of the deck. The second anti-vibration rubber portion includes a first anti-vibration sub-rubber having the third surface, a second anti-vibration sub-rubber having the fourth surface, and a plate located between the first anti-vibration sub-rubber and the second anti-vibration sub-rubber. The plate located between the first anti-vibration sub-rubber and the second anti-vibration sub-rubber has a greater hardness than the first and second anti-vibration sub-rubbers.

Provided is a treadmill. The treadmill includes a shock absorbing portion configured to absorb a shock applied to a deck. The shock absorbing portion includes a second anti-vibration rubber portion having a third surface fixed to a frame and a fourth surface fixed to the deck. The third and fourth surfaces are perpendicular to a plate surface direction of the deck. The second anti-vibration rubber portion includes a first anti-vibration sub-rubber having the third surface, a second anti-vibration sub-rubber having the fourth surface, and a plate located between the first anti-vibration sub-rubber and the second anti-vibration sub-rubber. The plate located between the first anti-vibration sub-rubber and the second anti-vibration sub-rubber has a greater hardness than the first and second anti-vibration sub-rubbers.

The spring includes an elastic member having a liquid accommodating chamber. The sealing member includes a base plate, a pressure plate, and a pressure elastic membrane provided in the liquid accommodating chamber. The pressure elastic membrane has a lip portion radially extending from an end portion of the pressure elastic membrane. The lip portion is provided with a projection. The pressure plate and the base plate define a clamping recess together. The lip portion is pressed in the clamping recess to seal the liquid accommodating chamber.

The spring includes an elastic member having a liquid accommodating chamber. The sealing member includes a base plate, a pressure plate, and a pressure elastic membrane provided in the liquid accommodating chamber. The pressure elastic membrane has a lip portion radially extending from an end portion of the pressure elastic membrane. The lip portion is provided with a projection. The pressure plate and the base plate define a clamping recess together. The lip portion is pressed in the clamping recess to seal the liquid accommodating chamber.

A bearing structure for large and heavy machines and systems, such as a wind turbine for example. In particular, the invention relates to such a bearing structure based on elastomer bearing elements, which can be mounted and exchanged individually without having to at least partly disassemble the bearing structure together with the system or machine. A method for simply exchanging elastomer elements in a bearing for heavy and large systems and machines.

A bearing structure for large and heavy machines and systems, such as a wind turbine for example. In particular, the invention relates to such a bearing structure based on elastomer bearing elements, which can be mounted and exchanged individually without having to at least partly disassemble the bearing structure together with the system or machine. A method for simply exchanging elastomer elements in a bearing for heavy and large systems and machines.

Externally-damped electromechanical valve assemblies well-suited for deployment within high vibratory operating environments, such as those associated with work vehicle engines, are provided. In embodiments, the valve assembly includes a housing through which a flow passage extends, a valve element positioned in the flow passage, a valve actuator, and control electronics electrically coupled to the valve actuator. The valve assembly may also contain a constrained layer damper including a first mass element and a first viscoelastic layer. The first mass element is mounted in suspension to the housing exterior for movement relative thereto when the first mass element is excited by vibrations transmitted through the housing. Constrained between the first mass element and the housing exterior, the first viscoelastic layer deflects in shear as the first mass element moves relative to the housing to attenuate the vibrations transmitted through the housing by conversion of vibrational energy to heat.

Externally-damped electromechanical valve assemblies well-suited for deployment within high vibratory operating environments, such as those associated with work vehicle engines, are provided. In embodiments, the valve assembly includes a housing through which a flow passage extends, a valve element positioned in the flow passage, a valve actuator, and control electronics electrically coupled to the valve actuator. The valve assembly may also contain a constrained layer damper including a first mass element and a first viscoelastic layer. The first mass element is mounted in suspension to the housing exterior for movement relative thereto when the first mass element is excited by vibrations transmitted through the housing. Constrained between the first mass element and the housing exterior, the first viscoelastic layer deflects in shear as the first mass element moves relative to the housing to attenuate the vibrations transmitted through the housing by conversion of vibrational energy to heat.

A bearing assembly is for movably coupling first and second members and includes first and second laminated bodies disposed within the second member bore, spaced about a centerline and connected with the first member. The first laminated is formed of alternating, arcuate first elastomeric laminae and arcuate first rigid laminae nested generally about a first central axis, each first rigid lamina having a first radial thickness between inner and outer surfaces. The second laminated body is formed of alternating, arcuate second elastomeric laminae and arcuate second rigid laminae nested generally about a second central axis, each second rigid lamina having a second radial thickness between the rigid lamina inner and outer surfaces. The first radial thickness of the first rigid laminae is substantially greater than the second radial thickness of the second rigid laminae such that the second laminated body has a substantially lesser stiffness than the first laminated body.

A bearing assembly is for movably coupling first and second members and includes first and second laminated bodies disposed within the second member bore, spaced about a centerline and connected with the first member. The first laminated is formed of alternating, arcuate first elastomeric laminae and arcuate first rigid laminae nested generally about a first central axis, each first rigid lamina having a first radial thickness between inner and outer surfaces. The second laminated body is formed of alternating, arcuate second elastomeric laminae and arcuate second rigid laminae nested generally about a second central axis, each second rigid lamina having a second radial thickness between the rigid lamina inner and outer surfaces. The first radial thickness of the first rigid laminae is substantially greater than the second radial thickness of the second rigid laminae such that the second laminated body has a substantially lesser stiffness than the first laminated body.